WO2006035655A1

WO2006035655A1 - Load control system

Info

Publication number: WO2006035655A1
Application number: PCT/JP2005/017451
Authority: WO
Inventors: Hiroshi Chinda; Mitsuaki Nakanishi
Original assignee: Fujikura Rubber Ltd.
Priority date: 2004-09-30
Filing date: 2005-09-22
Publication date: 2006-04-06
Also published as: CN101031853A; US20080098731A1; JP2006099690A; KR20070073769A

Abstract

[PROBLEMS] A load control system that highly accurately controls pressure of a pneumatic apparatus and can quickly cope with a pressure variation. [MEANS FOR SOLVING PROBLEMS] A pressure regulation screw (61) for setting a secondary pressure of a pressure regulation apparatus body (60), which supplies compressed air as a secondary pressure to a pneumatic cylinder device (10), is connected to a motor shaft (42) of a rotation drive device (41) through bowl-shaped members (51, 52) having flexibility in a direction to approach and separate from each other. A drive control circuit (30), having received a pressure signal outputted from a pressure sensor (14a) of the pneumatic cylinder device (10), pivotally drives the pressure regulation screw (61) through the motor shaft (42) of the rotation drive device (41) and the bowl-shaped members (51, 52) so that the pressure signal maintains a set value.

Description

Specification

Load control system

Technical field

The present invention relates to a load control system of pneumatic equipment used in FA (factory automation) and the like.

Background art

In recent years, FA equipment has rapidly progressed, and pneumatic devices have been used in manufacturing processes of various industrial products. Because the air from the air pressure source supplied to the pressure regulator is compressed by the compressor, the pressure regulator must prevent pulsation of the supplied compressed air and reduce the pressure to the required pressure. Furthermore, even if the pressure of the air pressure source changes, the air pressure on the output side must be kept constant. Conventionally, a passive pressure regulator has been used for such control. In addition, a pressure regulator has been developed to ensure an accurate flow rate (Patent Document 1).

Patent Document 1: Japanese Patent Application Laid-Open No. 11-95843

Disclosure of the invention

Problem that invention tries to solve

[0003] The precision of industrial products is rapidly advancing, and the precision of pneumatic devices is desired.

That is, even if the pressure of the air pressure source changes, the pressure-reduced air needs to be stable, and the pressure of the air pressure device driven by the compressed air supplied from the pressure regulator is set from the set value to the pole. It is also necessary to ensure an accurate flow rate with good response in order to keep it constant so that the force does not fluctuate.

[0004] Therefore, an object of the present invention is to provide a load control system that can control the pressure of a pneumatic device with high accuracy and can quickly respond to pressure fluctuations.

Means to solve the problem

[0005] In order to solve this problem, the present invention provides an pneumatic cylinder device equipped with a load sensor or a pressure sensor, and supplying an input primary pressure gas to the pneumatic cylinder device as a secondary pressure gas. Pressure control device body, and output side two connected to the pressure control device body Pressure adjustment screw for setting the secondary pressure, rotary drive means for adjusting the pressure adjustment degree by rotating the pressure adjustment screw, and interposed between the pressure adjustment screw and the rotation drive means, substantially facing each other A pair of flexible members arranged in a direction away from each other is provided, wherein one of the flexible members is connected to a rotational drive means substantially at the center of its top, and the flexible members are flexible. On the other side of the member, the pressure adjustment device is connected to the pressure adjustment screw at the approximate top center thereof, and the load sensor or pressure sensor force of the pneumatic cylinder device. Alternatively, the control means drives the rotational drive means of the pressure regulation means so that the pressure signal holds the set value.

More practically, the pneumatic cylinder device is a load device that presses a work at a set constant pressure, and the pressure control device is configured to maintain the constant pressure. Drive control.

[0007] The rotation drive means comprises a stepping motor, and the control means comprises PID control means, and the PID control means comprises the load motor or the pressure signal output from the load sensor or pressure sensor. Calculates the drive pulse to drive the drive and performs pulse drive.

Effect of the invention

According to the present invention, since there is no backlash in the drive mechanism that pressure-regulates and drives the pressure regulator, the pressure regulation control can be performed quickly and accurately with improved responsiveness in pressure-regulate drive. it can.

BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a block diagram showing an embodiment of a load control system to which the present invention is applied. The pneumatic cylinder device 10 is configured to press the load cell 20 via a pressing plate 13 and an attachment 14 which are fixed to the tip of the piston rod 12 which protrudes downward from the cylinder body 11. The pneumatic cylinder device 10 is supplied with compressed air supplied from the compressor 100 at a primary pressure after being reduced to a secondary pressure set by the motor-driven regulator 40. The attachment 14 of the pneumatic cylinder device 10 is provided with a load sensor or pressure sensor 14a for measuring a load, and the load signal or pressure signal detected by the load sensor or pressure sensor 14a is processed by the drive control circuit 30. , The motor driven regulator 40 is driven to adjust the secondary pressure. The load signal or pressure signal input to the drive control circuit 30 is amplified by the amplification amplifier 31, high frequency components are removed by the low pass filter 32, and converted to digital signals by the AZD converter 33. By this, the noise control input inputted to the noise conversion circuit 35 is calculated. Then, the pulse conversion circuit 35 generates a pulse signal for driving the motor driven regulator 40. The motor-driven regulator 40 is driven via the motor driver 36 by the pulse signal generated by the PID control in this manner.

[0011] FIG. 2 shows a partially cut front view of the motor driven regulator 40, and FIG. 3 shows a side view of the motor driven regulator 40. As shown in FIG. When this motor-driven regulator 40 outputs the primary pressure air (arrow IN in FIG. 2) input from the compressor 100 as secondary pressure air (arrow OUT in FIG. 2), the secondary pressure on the output side is output. The pressure adjustment device body 60 for adjusting the pressure adjustment screw 61 connected to the pressure adjustment device body 60 to set the secondary pressure on the output side, and the pressure adjustment screw 61 to adjust the pressure adjustment degree , And a connection for transmitting the rotational driving force of the rotary drive 41, which is interposed between the pressure adjustment screw 61 and the rotary drive 41, to the pressure adjustment screw 61. With a fitting 50.

The pressure control apparatus body 60 adjusts the secondary pressure on the output side of the pressure control apparatus body 60 by rotating the pressure control screw 61 and moving the pressure control screw 61 up and down in the axial direction. Are able to

The rotational drive device 41 is provided with a motor as a rotational drive source. In this embodiment, as a motor, a stepping motor capable of remote control with extremely high rotational angle control accuracy is provided.

A connection joint 50 is connected to the motor shaft 42 of the rotary drive device 41 via a connection member 43. The connection joint 50 includes a pair of hemispherical wedge-shaped members 51 and 52 having flexibility in the direction in which the distance between the tops is changed (contact and separation direction), the tops of which are disposed opposite to each other at a predetermined interval. There is. The wedge-shaped members 51, 52 have a circular hole for connection at the center (apex) of the top. The connecting member 43 is inserted into the hole of one of the wedge-shaped members 51 and fixed to the periphery of the hole so as to rotate integrally with the wedge-shaped member 51, and the hole of the other wedge-shaped member 52 is adjusted. A connecting member 62 fixed to the projecting end of the pressure screw 61 is inserted and fixed to the peripheral portion of the hole so as to rotate integrally with the wedge-shaped member 52. [0015] The pair of wedge members 51, 52 have their opposing circular peripheries joined together and fixed by a ring-shaped fixing member 53, and when the motor shaft 42 rotates, the wedge members 51, 52 rotate in the rotational direction. I hate to rotate in unison. The pair of wedge-shaped members 51, 52 can be joined without using the fixing member 53. For example, after the peripheral portions of the wedge-shaped members 51 and 52 are brought into contact with each other, these opening peripheral portions may be fused and fixed.

A drive control circuit 30 is connected to the rotational drive device 41. Then, the step motor is step-rotated by the pulse signal output from the drive control circuit 30, and the pressure adjustment screw 61 is rotationally driven and adjusted by the motor shaft 42 and the connection joint 50. That is, when the motor shaft 42 of the rotational drive device 41 rotates, the pressure adjustment screw 61 is rotated via the connection member 43, the wedge members 51 and 52, and the connection member 62, and the pressure adjustment screw 61 engages with its lead. Therefore, the secondary pressure on the output side of the pressure control apparatus body 60 can be adjusted by moving upward or downward while rotating. Although the motor shaft 42 does not move in the axial direction regardless of the rotation, the wedge members 51, 52 are deformed in the axial direction to allow the pressure adjustment screw 61 to move toward and away from the motor shaft 42. . At that time, since the pair of wedge-shaped members 51, 52 hardly resists the twisting force around the axis, the rotation of the motor shaft 42 free from backlash etc. is transmitted to the pressure adjusting screw 61 without any delay. Can be transmitted at a rotation ratio of

FIG. 4 is a graph showing the operating characteristics according to the present embodiment. The code P indicates the case of the conventional nossive control system P, and the code A indicates the case of the active control system of the present embodiment, and indicates the response characteristics when the load cell 20 is vibrated. As described above, according to the present embodiment, even if the load of the load cell 20 changes, the motor driven regulator 40 operates quickly to cancel the change and the load and pressure can be kept constant.

The pressure regulator main body 60 may be of any of various known structures, and preferably has high precision and short response time.

The flexible connection joint 50 is not limited to the illustrated hemispherically-shaped wedge-shaped members 51 and 52, and the outer peripheral shape of the joint portion which may be a conical shape may be polygonal.

The drive control circuit 30 can be configured by a personal computer or the like, and the control method is not limited to PID control.

Brief description of the drawings FIG. 1 is a block diagram showing an embodiment of a load control system to which the present invention is applied.

FIG. 2 is a front view, partly cut away, of a motor-driven regulator that is an embodiment of a pressure regulator used in the load control system.

FIG. 3 is a side view of a motor-driven regulator as an embodiment of a pressure regulator used in the load control system.

FIG. 4 is a graph showing response characteristics when a load cell is vibrated according to the embodiment of the load control system to which the present invention is applied.

Explanation of sign

[0022] 10 pneumatic cylinder device

11 cylinder body

12 piston rod

13 Pressure plate

14 Attachment

20 road, senore

30 Drive control circuit

31 Amplifier

32 low pass filter

33 AZD change

34 PID Compensator

36 Motor driver

40 Motor-driven Regulator

41 Rotary drive

42 motor shaft

50 connection joint

51 52 Vertical member

53 Fixing member

60 Pressure Control Device Body

61 Pressure adjustment screw Connection member Compressor

Claims

The scope of the claims

[1] A pneumatic cylinder device equipped with a load sensor or a pressure sensor,

A pressure control apparatus main body which supplies the gas of the primary pressure input to the pneumatic cylinder device as the gas of the secondary pressure;

A pressure adjustment screw connected to the pressure adjustment apparatus main body for setting the secondary pressure on the output side, a rotational drive means for rotating the pressure adjustment screw to adjust the pressure adjustment degree! /, And the pressure adjustment A pair of substantially opposed flexible members interposed between the screw and the rotational drive means and arranged in substantially opposite directions are provided, and one of the flexible members is provided with the pair of flexible members. A pressure control device in which a rotational drive means is connected substantially at the center of the top, and the pressure adjustment screw is connected at the approximately top center of the other of the flexible members;

Control for driving the rotational drive means of the pressure control means so that the load signal or pressure signal holds the set value in response to the load signal or pressure signal output from the load sensor or pressure sensor force of the pneumatic cylinder device And a means for controlling the load.

[2] The pneumatic cylinder device is a load device for pressing a work with a set pressure, and the pressure control device drives and controls the pressure control apparatus main body so as to keep the set pressure constant. Load control system.

[3] The rotation driving means is a stepping motor, and the control means includes PID control means, and the PID control means generates the stepping signal from the load signal or pressure signal output from the load sensor or pressure sensor. The load control system according to claim 1 or 2, wherein a drive pulse for driving the motor is calculated and pulse drive is performed.